Two masses of 3.4 kg and 2.5 kg are accelerated from an initial speed of 5 m / s and 12 m / s, respectively. The distances traversed by the masses in…

Two masses of $\displaystyle 3.4$ kg and $\displaystyle 2.5$ kg are accelerated from an initial speed of $\displaystyle 5 \mathrm{~m} / \mathrm{s}$ and $\displaystyle 12 \mathrm{~m} / \mathrm{s}$, respectively. The distances traversed by the masses in the $\displaystyle 5^{\text {th }}$ second are $\displaystyle 104$ m and $\displaystyle 129$ m, respectively. The ratio of their momenta after $\displaystyle 10$ s is $\displaystyle \frac{x}{8}$. The value of $\displaystyle x$ is $\displaystyle \_\_\_\_$.